Note 9 - Allowance for Credit Losses and Credit Quality Information (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Financing Receivable, Accrued Interest, after Allowance for Credit Loss	$ 3,200		$ 3,000
Off-Balance-Sheet, Credit Loss, Liability	0	$ 100
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal)	0	$ 0
Financing Receivable, Nonaccrual	2,800		3,818
Financing Receivable, Nonaccrual, Allowance for Credit Loss	400		400
Loan Receivable for Which Value of Collateral Sufficient to Repay	1,200		$ 1,300
Financing Receivable, Principal Payments Received, Non-Performing	$ 800
Number of Secured Loans	2		0
Financing Receivables in Process of Foreclosure	$ 100
Number of Loan Modifications for Borrowers with Financial Difficulty	0	0
Financing Receivable, Modified, Commitment to Lend	$ 0
Number of Loan Defaults Previously Modified for Borrowers Experiencing Financial Difficulty	0